Submitted on: 29 April 2018.
Revised on: 20 July 2018.
Accepted on: 15 August 2018.
___________________International Electronic Journal of Geometry
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Submitted on: 21 June 2001.
Revised on: 15 October 2001.
Accepted on: 01 December 2001.
___________________International Electronic Journal of Geometry
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http://reply.papertrans.cn/2/129/12863/12863-25.png
Submitted on: 02 December 2022.
Revised on: 24 February 2023.
Accepted on: 02 April 2023.
___________________International Electronic Journal of Geometry
http://reply.papertrans.cn/2/129/12863/12863-27.png
Submitted on: 27 September 2009.
Revised on: 17 October 2009.
Accepted on: 13 November 2009.
___________________International Electronic Journal of Geometry
Submitted on: 16 August 2008.
Revised on: 05 December 2008.
Accepted on: 09 January 2009.
___________________International Electronic Journal of Geometry
Submitted on: 16 January 1998.
Revised on: 04 April 1998.
Accepted on: 22 May 1998.
___________________International Electronic Journal of Geometry